If gparted is used to create an msdos partition table, but NO partitions, then 'Erase Disk' in usb-creator-gtk fails with the timeout error.
If gparted is used to create an (empty) FAT32 partition, then 'Erase Disk' in usb-creator-gtk seems to succeed, but the "Make Startup Disk" button remains grayed out so you can't do anything with it.
I ran usb-creator-gtk -i file.iso because the interactive iso picker does not work.
Furthermore:
If gparted is used to create an msdos partition table, but NO partitions, then 'Erase Disk' in usb-creator-gtk fails with the timeout error.
If gparted is used to create an (empty) FAT32 partition, then 'Erase Disk' in usb-creator-gtk seems to succeed, but the "Make Startup Disk" button remains grayed out so you can't do anything with it.
I ran usb-creator-gtk -i file.iso because the interactive iso picker does not work.